[compiler] Generalize context load/store operations in code-stub-assembler.

[compiler] Generalize context load/store operations in code-stub-assembler.

The existing Load/StoreContextElement operations take the index as an int.  This
CL adds versions that take the index as a Node.  These already existed in the
interpreter-assembler, from which they are now removed.

R=mstarzinger@chromium.org, rmcilroy@chromium.org
BUG=

Committed: https://crrev.com/08da5c98cfdac4a690bcaf74781f458d89d910a8
Cr-Commit-Position: refs/heads/master@{#40810}

[neis, 2016-11-04 13:42:11]

Not sure what to do with the unittests. They don't belong there anymore but I
couldn't find analogous tests for the code-stub-assembler.

[rmcilroy, 2016-11-04 14:25:52]

> Not sure what to do with the unittests. They don't belong there anymore but I
> couldn't find analogous tests for the code-stub-assembler

Probably not worth keeping them any longer.

LGTM, thanks.

[neis, 2016-11-07 17:15:00]

The CQ bit was checked by neis@chromium.org

[neis, 2016-11-07 17:15:01]

The patchset sent to the CQ was uploaded after l-g-t-m from
rmcilroy@chromium.org
Link to the patchset: https://codereview.chromium.org/2473003004/#ps20001
(title: "Remove tests.")

[commit-bot: I haz the power, 2016-11-07 17:15:06]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-07 17:42:20]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-17 22:25:01]

Description was changed from

==========
[compiler] Generalize context load/store operations in code-stub-assembler.

The existing Load/StoreContextElement operations take the index as an int.  This
CL adds versions that take the index as a Node.  These already existed in the
interpreter-assembler, from which they are now removed.

R=mstarzinger@chromium.org, rmcilroy@chromium.org
BUG=
==========

to

==========
[compiler] Generalize context load/store operations in code-stub-assembler.

The existing Load/StoreContextElement operations take the index as an int.  This
CL adds versions that take the index as a Node.  These already existed in the
interpreter-assembler, from which they are now removed.

R=mstarzinger@chromium.org, rmcilroy@chromium.org
BUG=

Committed: https://crrev.com/08da5c98cfdac4a690bcaf74781f458d89d910a8
Cr-Commit-Position: refs/heads/master@{#40810}
==========

[commit-bot: I haz the power, 2016-11-17 22:25:02]

Patchset 2 (id:??) landed as
https://crrev.com/08da5c98cfdac4a690bcaf74781f458d89d910a8
Cr-Commit-Position: refs/heads/master@{#40810}